<style>
  #loading {
    display: block;
    position: absolute;
    left: 50%;
    top: 50%;
    width: 150px;
    height: 150px;
    margin: -75px 0 0 -75px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #16a085;
    -webkit-animation: spin 1.7s linear infinite;
    animation: spin 1.7s linear infinite;
    z-index: 11;
  }
  #loading:before {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #e74c3c;
    -webkit-animation: spin-reverse 0.6s linear infinite;
    animation: spin-reverse 0.6s linear infinite;
  }
  #loading:after {
    content: '';
    position: absolute;
    top: 15px;
    left: 15px;
    right: 15px;
    bottom: 15px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #f9c922;
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
  }

  @keyframes spin {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(360deg);
    }
  }
  @keyframes spin-reverse {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(-360deg);
    }
  }
</style>
<div id="loading"></div>
